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x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable

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For boot-time switching between 4- and 5-level paging we need to be able
to fold p4d page table level at runtime. It requires variable
PGDIR_SHIFT and PTRS_PER_P4D.

The change doesn't affect the kernel image size much:

   text	   data	    bss	    dec	    hex	filename
8628091	4734304	1368064	14730459	 e0c4db	vmlinux.before
8628393	4734340	1368064	14730797	 e0c62d	vmlinux.after

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180214111656.88514-7-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov
2018-02-14 14:16:53 +03:00
committed by Ingo Molnar
parent 5c7919bb19
commit c65e774fb3
13 changed files with 44 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
include/asm-generic/5level-fixup.h
View File

@@ -8,6 +8,7 @@
#define P4D_SHIFT PGDIR_SHIFT
#define P4D_SIZE PGDIR_SIZE
#define P4D_MASK PGDIR_MASK
#define MAX_PTRS_PER_P4D 1
#define PTRS_PER_P4D 1
#define p4d_t pgd_t

9
include/asm-generic/pgtable-nop4d.h
View File

@@ -8,10 +8,11 @@
typedef struct { pgd_t pgd; } p4d_t;
#define P4D_SHIFT PGDIR_SHIFT
#define PTRS_PER_P4D 1
#define P4D_SIZE (1UL << P4D_SHIFT)
#define P4D_MASK (~(P4D_SIZE-1))
#define P4D_SHIFT PGDIR_SHIFT
#define MAX_PTRS_PER_P4D 1
#define PTRS_PER_P4D 1
#define P4D_SIZE (1UL << P4D_SHIFT)
#define P4D_MASK (~(P4D_SIZE-1))
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level